#include <stdio.h>
int main()
{
	int year, leap;
	printf("enter year:");
	scanf("%d",&year);
	if(year%4==0)
	 if(year%100==0)
	  if(year%400==0)
	  leap=1;
	  else leap=0;
	 else leap=1;
	else leap=0;
	if(leap) 
	printf("%d is",year);
	else printf("%d is not",year);
	printf(" a leap year.\n");
	return 0;
 } 
 
